feature #1612: Functions to check if a disk is volatile and to compute the total size of volatile disks of a template
Feature #1612: Add VOLATILE_SIZE to VM quotas
Feature #1612: Add VOLATILE_SIZE quota to CLI
Feature #1612: Add VOLATILE_SIZE quota to Sunstone
Feature #1612: Add VOLATILE_SIZE quota to onedb migrator and fsck
Feature #1612: Add VOLATILE_SIZE quota to xsd doc files
Merge branch 'feature-1612'